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Anyone ever used an SEI lower unit? #12267143 05/29/17 12:43 AM
Joined: Nov 2010
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RJF1423 Offline OP
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I bought a boat the other day with a bum lower unit that I was going to have rebuilt when I ran across SEI lower units. Brand new aftermarket lower units for around $900 with a 3 year warranty.

Worth it? Or is it a better idea to just rebuild the lower unit i have?

Last edited by RJF1423; 05/29/17 12:44 AM.
Moritz Chevrolet - 9101 Camp Bowie W Blvd, Fort Worth, TX - Monte Coon (817) 696-2003
Re: Anyone ever used an SEI lower unit? [Re: RJF1423] #12267146 05/29/17 12:45 AM
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tmd11111 Offline
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I helped a friend install one a few years ago on a mercruiser alpha stern drive. I know he ran it a few years without issue before he sold it.

Re: Anyone ever used an SEI lower unit? [Re: tmd11111] #12267173 05/29/17 01:03 AM
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Dosser Offline
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My dad has one on his merc and had no problems. And I've had one on my etec for about 6 months. Both have been trouble free

Re: Anyone ever used an SEI lower unit? [Re: RJF1423] #12267221 05/29/17 01:41 AM
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Kens3313 Offline
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Ive had 2 SEI lower units the first one lasted about 4 years and drive shaft broke and I'm on my 2nd one now. have had it about a year. I'm not really sure why the drive shaft snapped on my last SEI lower unit but its definatley cheaper than paying around 2500 for a new Mercury one. They get the job done and have a 3 year no fault warranty. Dunno if this will help your decision, just thought I would share my experience with them.


Re: Anyone ever used an SEI lower unit? [Re: RJF1423] #12267223 05/29/17 01:42 AM
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Curtbass Offline
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I have ran 2 different SEI lowers on 2 motors. Serviced & kept quality oil in them & never had a problem. Also have had rebuilt OEM's. 2 had no problems & 2 bit the dust. So technically SEI success rate 100% & OEM rebuilds 50%. All had over 100 hrs aervice before sold. Except the 2 that shelled out. One at around 40 hrs the other around 80. I wouldnt be afraid of another one especially for the $ difference.


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Re: Anyone ever used an SEI lower unit? [Re: RJF1423] #12267425 05/29/17 04:05 AM
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DEADSTICKER Offline
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had mine going on 3 years and no problems

Re: Anyone ever used an SEI lower unit? [Re: RJF1423] #12267467 05/29/17 06:20 AM
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ETxRT Offline
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Be careful,a lot of guys have run them and had the drive shift break, losing a $4-500 prop which they won't and don't replace. They have no problem replacing the lower unit, but forget about it when you lose the prop.


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Re: Anyone ever used an SEI lower unit? [Re: RJF1423] #12267555 05/29/17 12:18 PM
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Matt Jackson Offline
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My buddy is on his second. They hold true to their no fault warrant. The first one went out so he sent it in and they did replace but said it failed due to improper break in which may have been true. If you fish a lake with a lot of stumps to hit I wouldn't hesitate to buy one or if I have had several dings on my insurance.

Re: Anyone ever used an SEI lower unit? [Re: RJF1423] #12267635 05/29/17 01:28 PM
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Fishingking Offline
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Not bad product

Re: Anyone ever used an SEI lower unit? [Re: RJF1423] #12268143 05/29/17 09:02 PM
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El Skeeter Offline
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Read the fine print, warranty is VOID if you fish tournaments.

Re: Anyone ever used an SEI lower unit? [Re: El Skeeter] #12268183 05/29/17 09:41 PM
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SteezMacQueen Online Happy
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Originally Posted By: El Skeeter
Read the fine print, warranty is VOID if you fish tournaments.


No it doesn't. It says "commercial use" isn't covered. I don't think a local tourney is considered "commercial use". Also denotes "racing or competitive use". I have talked to them once before and they specifically have stated that fishing tourneys on a local level is fine. They are NOT warranting a product that is being used in a racing application.


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Re: Anyone ever used an SEI lower unit? [Re: RJF1423] #12268324 05/29/17 11:26 PM
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Rick Collis Offline
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I have used them on a couple different boats. Never a problem. Break them in and change the oil.


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Re: Anyone ever used an SEI lower unit? [Re: RJF1423] #12268961 05/30/17 12:15 PM
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Outdoordude Offline
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I've had one SEI lower unit, the prop shaft snapped clean off running 30 mph in the middle of a flat calm river about 15 hours after it was installed. Followed break-in to the letter and never hit a thing. They did replace it for free no questions, and even sent a replacement prop when I -----ed about losing my nice balanced and worked one. The one they sent was not great, but it was a prop. The next shaft held up fine, sold the boat a little over a year later with no other problems


Scott Jones
Re: Anyone ever used an SEI lower unit? [Re: RJF1423] #12269034 05/30/17 01:16 PM
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Curtbass Offline
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If you dont know how to rebuild a lower unit & shim it out then yes on an SEI. Even if you have the tools needed (most dont) it still has to be shimmed to thrust tolerances within specs or it probably wont last. SEI is still cheaper to run even if prop shaft breaks & you lose a prop unless your running a $2000 prop. If they were such an inferior product they wouldnt have stayed in business over 25 years. I'm not afraid to run one.


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Re: Anyone ever used an SEI lower unit? [Re: Rick Collis] #12269088 05/30/17 01:36 PM
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Robbie Milam Offline
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Originally Posted By: Rick Collis
I have used them on a couple different boats. Never a problem. Break them in and change the oil.

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